概述: windows 系统下获取进程的环境变量，可参考文章 【通过PEB获取进程模块信息】和 文章 【PEB】。
在网上能看到相关开源的代码，基本上都是读取进程的内存，再遍历相关内存获取，获取保存进程环境变量的块，得到对应的环境变量内容。
相关函数及结构了解
首先需要了解PEB的结构，查看PEB可以使用windbg 命令查看
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| 1: kd> dt _PEB
ntdll!_PEB
+0x000 InheritedAddressSpace : UChar
+0x001 ReadImageFileExecOptions : UChar
+0x002 BeingDebugged : UChar
+0x003 BitField : UChar
+0x003 ImageUsesLargePages : Pos 0, 1 Bit
+0x003 IsProtectedProcess : Pos 1, 1 Bit
+0x003 IsImageDynamicallyRelocated : Pos 2, 1 Bit
+0x003 SkipPatchingUser32Forwarders : Pos 3, 1 Bit
+0x003 IsPackagedProcess : Pos 4, 1 Bit
+0x003 IsAppContainer : Pos 5, 1 Bit
+0x003 IsProtectedProcessLight : Pos 6, 1 Bit
+0x003 IsLongPathAwareProcess : Pos 7, 1 Bit
+0x004 Padding0 : [4] UChar
+0x008 Mutant : Ptr64 Void
+0x010 ImageBaseAddress : Ptr64 Void
+0x018 Ldr : Ptr64 _PEB_LDR_DATA
+0x020 ProcessParameters : Ptr64 _RTL_USER_PROCESS_PARAMETERS
+0x028 SubSystemData : Ptr64 Void
+0x030 ProcessHeap : Ptr64 Void
+0x038 FastPebLock : Ptr64 _RTL_CRITICAL_SECTION
+0x040 AtlThunkSListPtr : Ptr64 _SLIST_HEADER
+0x048 IFEOKey : Ptr64 Void
+0x050 CrossProcessFlags : Uint4B
+0x050 ProcessInJob : Pos 0, 1 Bit
+0x050 ProcessInitializing : Pos 1, 1 Bit
+0x050 ProcessUsingVEH : Pos 2, 1 Bit
+0x050 ProcessUsingVCH : Pos 3, 1 Bit
+0x050 ProcessUsingFTH : Pos 4, 1 Bit
+0x050 ProcessPreviouslyThrottled : Pos 5, 1 Bit
+0x050 ProcessCurrentlyThrottled : Pos 6, 1 Bit
+0x050 ProcessImagesHotPatched : Pos 7, 1 Bit
+0x050 ReservedBits0 : Pos 8, 24 Bits
+0x054 Padding1 : [4] UChar
+0x058 KernelCallbackTable : Ptr64 Void
+0x058 UserSharedInfoPtr : Ptr64 Void
+0x060 SystemReserved : Uint4B
+0x064 AtlThunkSListPtr32 : Uint4B
+0x068 ApiSetMap : Ptr64 Void
+0x070 TlsExpansionCounter : Uint4B
+0x074 Padding2 : [4] UChar
+0x078 TlsBitmap : Ptr64 Void
+0x080 TlsBitmapBits : [2] Uint4B
+0x088 ReadOnlySharedMemoryBase : Ptr64 Void
+0x090 SharedData : Ptr64 Void
+0x098 ReadOnlyStaticServerData : Ptr64 Ptr64 Void
+0x0a0 AnsiCodePageData : Ptr64 Void
+0x0a8 OemCodePageData : Ptr64 Void
+0x0b0 UnicodeCaseTableData : Ptr64 Void
+0x0b8 NumberOfProcessors : Uint4B
+0x0bc NtGlobalFlag : Uint4B
+0x0c0 CriticalSectionTimeout : _LARGE_INTEGER
+0x0c8 HeapSegmentReserve : Uint8B
+0x0d0 HeapSegmentCommit : Uint8B
+0x0d8 HeapDeCommitTotalFreeThreshold : Uint8B
+0x0e0 HeapDeCommitFreeBlockThreshold : Uint8B
+0x0e8 NumberOfHeaps : Uint4B
+0x0ec MaximumNumberOfHeaps : Uint4B
+0x0f0 ProcessHeaps : Ptr64 Ptr64 Void
+0x0f8 GdiSharedHandleTable : Ptr64 Void
+0x100 ProcessStarterHelper : Ptr64 Void
+0x108 GdiDCAttributeList : Uint4B
+0x10c Padding3 : [4] UChar
+0x110 LoaderLock : Ptr64 _RTL_CRITICAL_SECTION
+0x118 OSMajorVersion : Uint4B
+0x11c OSMinorVersion : Uint4B
+0x120 OSBuildNumber : Uint2B
+0x122 OSCSDVersion : Uint2B
+0x124 OSPlatformId : Uint4B
+0x128 ImageSubsystem : Uint4B
+0x12c ImageSubsystemMajorVersion : Uint4B
+0x130 ImageSubsystemMinorVersion : Uint4B
+0x134 Padding4 : [4] UChar
+0x138 ActiveProcessAffinityMask : Uint8B
+0x140 GdiHandleBuffer : [60] Uint4B
+0x230 PostProcessInitRoutine : Ptr64 void
+0x238 TlsExpansionBitmap : Ptr64 Void
+0x240 TlsExpansionBitmapBits : [32] Uint4B
+0x2c0 SessionId : Uint4B
+0x2c4 Padding5 : [4] UChar
+0x2c8 AppCompatFlags : _ULARGE_INTEGER
+0x2d0 AppCompatFlagsUser : _ULARGE_INTEGER
+0x2d8 pShimData : Ptr64 Void
+0x2e0 AppCompatInfo : Ptr64 Void
+0x2e8 CSDVersion : _UNICODE_STRING
+0x2f8 ActivationContextData : Ptr64 _ACTIVATION_CONTEXT_DATA
+0x300 ProcessAssemblyStorageMap : Ptr64 _ASSEMBLY_STORAGE_MAP
+0x308 SystemDefaultActivationContextData : Ptr64 _ACTIVATION_CONTEXT_DATA
+0x310 SystemAssemblyStorageMap : Ptr64 _ASSEMBLY_STORAGE_MAP
+0x318 MinimumStackCommit : Uint8B
+0x320 SparePointers : [4] Ptr64 Void
+0x340 SpareUlongs : [5] Uint4B
+0x358 WerRegistrationData : Ptr64 Void
+0x360 WerShipAssertPtr : Ptr64 Void
+0x368 pUnused : Ptr64 Void
+0x370 pImageHeaderHash : Ptr64 Void
+0x378 TracingFlags : Uint4B
+0x378 HeapTracingEnabled : Pos 0, 1 Bit
+0x378 CritSecTracingEnabled : Pos 1, 1 Bit
+0x378 LibLoaderTracingEnabled : Pos 2, 1 Bit
+0x378 SpareTracingBits : Pos 3, 29 Bits
+0x37c Padding6 : [4] UChar
+0x380 CsrServerReadOnlySharedMemoryBase : Uint8B
+0x388 TppWorkerpListLock : Uint8B
+0x390 TppWorkerpList : _LIST_ENTRY
+0x3a0 WaitOnAddressHashTable : [128] Ptr64 Void
+0x7a0 TelemetryCoverageHeader : Ptr64 Void
+0x7a8 CloudFileFlags : Uint4B
+0x7ac CloudFileDiagFlags : Uint4B
+0x7b0 PlaceholderCompatibilityMode : Char
+0x7b1 PlaceholderCompatibilityModeReserved : [7] Char
+0x7b8 LeapSecondData : Ptr64 _LEAP_SECOND_DATA
+0x7c0 LeapSecondFlags : Uint4B
+0x7c0 SixtySecondEnabled : Pos 0, 1 Bit
+0x7c0 Reserved : Pos 1, 31 Bits
+0x7c4 NtGlobalFlag2 : Uint4B
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